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Transformer of Ladle Refining Furnace

We can design and manufacture the transformer of the ladle refining furnace according to the client’s required capacity, working hours, power supply, raw materials, and other related parameters. It can also be matched for users who already have the transformer of the ladle refining furnace.

Rated capacity: 2,000-44,000 KVA
Primary Voltage: 10-35 KV
Secondary Voltage: 185-486V
Weight: 8,000-78,000 kg

 

Description

The Transformer of Ladle Refining Furnace

The transformer of the ladle refining furnace is a kind of electric furnace transformer with low output voltage, large current, fixed arc spike and small current fluctuation. In order to adapt to the change in furnace conditions, precision on-load voltage regulation is selected for all transformers.

The transformer is a kind of electrical equipment used to change AC voltage and current and transmit AC energy. It is based on the principle of electromagnetic induction to complete the transmission of electric energy. Transformers can be divided into power transformers, test transformers, instrument transformers, and transformers for special purposes: power transformers are necessary equipment for power transmission and distribution and power user distribution.

 

Parameters

Model
Rated Capacity (KVA)
Rated Voltage
Link group member
Weight(Kg)
gauge(mm)
Outer size(mm)
Primary Voltage(KV)
Secondary Voltage(V)
length×width×height
HJSSP-2000/10
2000
10
185-150 4 level
Ddo
8000
1070
2100×1620×2590
HJSSP-2200/10
2200
10
180-150 4 level
Ddo
8300
1070
2350×1780×2600
HJSSP-2400/10
2400
10
200-190-180 6level
Yd11
9230
1070
2400×1670×2750
HJSSP-2500/20
2500
20
175-115 5 level
Yd11
8300
1070
2800×1600×2500
HJSSP-2800/10
2800
10
190-175-160 6level
Yd11
10300
1070
2800×1900×3300
HJSSP-3200/10
3200
10
180-110 5 level
Yd11
11000
1070
3260×1590×2700
HJSSP-4000/10
4000
10
210-155 4 level
Dd0
13450
1435
3000×2000×3500
HJSSP-5000/10
5000
10
212-195-155 5 level
Yd11
15000
1435
3200×2300×3100
HJSSP-5000/10
5000
10
210-195-180 6 level
Yd11
14500
1435
3200×1950×3400
HJSSP-5000/35
5000
35
215-196-155 5 level
Yd11
9100
1435
3800×2100×3150
HJSSP-5500/10
5500
10
230-212-145 6 level
Yd11
16000
1435
3200×2650×3550
HJSSP-5500/35
5500
35
210-121 6 level
Yd11
18900
1435
3800×2400×3350
HJSSP-5500/35
5500
35
212-195-155 lebel
Yd11
17850
1435
3700×2300×3800
HJSSP-6000/10
6000
10
230-206-145 6 level
Yd11
17000
1435
3760×1690×3280
HJSSP-6000/35
6000
35
220-182-145 6 level
Yd11
17500
1435
3810×1970×3170
HJSSP-6300/10
6300
10
364-313-262 6 level
Yd11
15600
1435
3564×2000×3000
HJSSP-6300/35
6300
35
225-200-151 6 level
Yd11
22000
1435
3750×2400×3750
HJSSP-6300/35
6300
35
215-155 5 level
Yd11
19000
1435
3700×2300×4500
HJSSP-6300/35
6300
35
240-190-160 6 level
Yd11
22000
1435
3990×4160×3920
HJSSPZ-7000/10
7000
10
200-135 7 level
Yd11
21500
1435
4120×2200×3000
HJSSP-7000/10
7000
10
216-161 5 level
Ddo
17500
1435
3600×2200×3600
HJSSP-7000/35
7000
35
220-145 6 level
Yd11
21600
1435
4350×2400×4500
HJSSPZ-7000/35
7000
35
225-188-151 6 level
Yd11
22000
1435
3590×2410×3680
HJSSPZ-7000/35
7000
35
250-204-130 6 level
Yd11
27000
1435
3855×2800×3980
HJSSP-8000/35
8000
35
240-155 6 level
Yd11
22000
1435
4200×2600×4600
HJSSPZ-8000/35
8000
35
270-250-170 9 level
Yd11
29500
1435
4600×2400×4000
HJSSPZ-8500/35
8500
35
240-220-155 6 level
Yd11
27500
1435
4500×2500×3700
HJSSP-9000/35
9000
35
240-223-165 13 level
Yd11
21500
1435
4120×2450×4100
HJSSPZ-9000/35
9000
35
240-224-195 9 level
Yd11
27500
1435
4400×2500×4100
HJSSP-10000/10
10000
10
240-170 9 level
Ddo
21000
1435
3800×2420×3900
HJSSPZ-10000/35
10000
35
260-240-160 9 level
Yd11
28000
1435
4400×2500×4400
HJSSPZ-12000/35
12000
35
270-250-165 9 level
Yd11
31500
1435
4500×2600×4300
HJSSP-12000/35
12000
35
270-250-170 9 level
Yd11
31000
1435
4600×2400×4300
HJSSPZ-12500/10
12500
10
270-225-150 15 level
Ddo
27500
1435
4520×2800×4700
HJSSPZ-12500/35
12500
35
270-250-170 9 level
Yd11
31700
1435
4500×2600×4400
HJSSPZ-12500/35
12500
35
270-250-170 9 level
Yd11
29000
1435
3900×2400×3850
HJSSPZ-13000/35
13000
35
240-220-120 9 level
Yd11
36000
1435
4100×3000×4050
HJSSPZ-14000/35
14000
35
290-260-210 9 level
Yd11
31900
1435
4520×3200×4700
HJSSPZ-14000/35
14000
35
300-267-190 11 level
Yd11
41200
1435
4000×3300×4200
HJSSPZ-15000/35
15000
35
370-270-170 13 level
Yd11
49500
1435
4200×4100×4500
HJSSPZ-15000/35
15000
35
300-240-150 11 level
Yd11
37500
1435
4300×3350×4800
HJSSPZ-15000/35
15000
35
315-285-165 13 level
Yd11
35400
1435
4700×2600×4700
HJSSPZ-17000/35
17000
35
330-270-170 9 level
Yd11
48500
1435
4600×3300×4200
HJSSPZ-18000/35
18000
35
345-312-235 11 level
Yd11
42700
1435
4300×3520×5000
HJSSPZ-20000/35
20000
35
350-309-228 13 level
Yd11
39500
1435
4800×2700×4700
HJSSPZ-21000/35
21000
35
340-310-240 11 level
Yd11
43500
1435
5200×3100×4500
HJSSPZ-22000/35
22000
35
370-319-200 11 level
Yd11
48500
1435
4700×3300×4500
HJSSPZ-23000/35
23000
35
350-315-191 13 level
Yd11
47850
1435
4600×3200×4600
HJSSPZ-24000/35
24000
35
395-345-190 17 level
Yd11
43800
1435
4900×2800×4800
HJSSPZ-25000/35
25000
35
400-325-160 17 level
Yd11
51400
1435
4700×4200×5000
HJSSPZ-26000/35
26000
35
400-360-220 17 level
Yd11
52000
1435
4750×3920×5150
HJSSPZ-26000/35
26000
35
420-384-276 13 level
Yd11
55000
1435
4400×3200×5100
HJSSPZ-28000/35
28000
35
420-340-260 19 level
Yd11
56000
1435
5200×3100×5250
HJSSPZ-28000/35
28000
35
425-395-305 13 level
Yd11
57000
1435
4300×3500×5150
HJSSPZ-30000/35
30000
35
480-400-240 19 level
Yd11
65000
2000
4850×3700×5600
HJSSPZ-35000/35
35000
35
380-355-230 13 level
Yd11
71000
2000
4600×3700×5200
HJSSPZ-38000/35
38000
35
480-405-300 19 level
Yd11
74500
2000
5100×5350×5700
HJSSPZ-44000/35
44000
35
486-464-366 19 level
Yd11
78000
2000
6450×4650×5500

Features

1. The transformer itself has good energy-saving characteristics: no-load loss, no-load current and load loss. Reduce the percentage of impedance voltage as much as possible, select appropriate capacity in common use, make use of existing high-quality raw materials and small oil gap and other advanced technologies, so as to make the transformer truly energy-saving, and the performance level is consistent with the products of international developed countries.

2. The transformer of the ladle refining furnace has very stable reliability and long service life. The product design technology of the new structure shall be verified by operation test and type test, and the design life shall not be less than 30 years.

3. A certain overload capacity is required to ensure the proper operation of various operation indicators under the condition of exceeding the weighing capacity and 20% load.

4. Reduce the maintenance workload of the user, so that the user will no longer hang the core in long-term use, and the design is free of charge

The maintenance time shall not be less than ten years. The overhaul free time is 20 years.

5. Selection of transformer material, structure and process: the following is divided into six parts as a brief introduction

Namely: iron core, winding, body, oil tank, general assembly and accessories. The following are introduced respectively

5.1 Iron core: in terms of materials, we selected a 30q130 silicon steel sheet produced by WISCO or a 30z130 silicon steel sheet produced by Nippon Steel Co., Ltd. of Japan. These materials are basically consistent with those used in internationally developed countries.

The structure adopts the full inclined seam sheet type, and the upper and lower clamps are connected with the pull plate structure of a low-magnetic steel plate, which changes the previous square iron structure, so that there are no holes and defects on the iron chip, the magnetic flux density of each section of the iron core is consistent and there is no distortion. In the shear process, the Jorge shear line imported from Germany is adopted, and the shear burr is controlled to be less than 0.02mm (the standard < 0.05 is the qualified product), and the length tolerance per meter is less than 0.2mm, so as to increase the lamination coefficient and reduce the butt joint gap, The local overheating of the iron core is avoided, and the product noise, no-load loss and no-load current are reduced.

5.2 Winding: use oxygen-free copper electromagnetic wire from the material to control its ρ 20 ℃ < 0.017241. In addition, the material and tightness of paper package insulation shall be controlled. The purpose is to make the coil have better axial and radial stability as far as possible. The coil adopts small oil gap, internal and external oil baffle, guiding cooling and hard paper cylinder structure, so as to make the structure compact, and improve the overload capacity and thermal stability. Losses have also decreased.

5.3 Body: all wood parts of the body are changed into laminated wood, which improves the stiffness of the lead frame. The upper and lower pressing plates are made of paperboard or epoxy resin. Compared with the iron pressing plate, it increases the insulation distance between the electrical conductor and the ground and reduces the size of “window height”. 1、 The secondary main insulation adopts imported paperboard, which increases the strength of the main insulation. The multi-coil adopts an integral suit, which improves the reliability of the product. The steam phase drying equipment produced in Norway is used for the drying of the body, which is completely dry without damaging the insulation, and has the function of flushing the body.

5.4 Oil tank: the oil tank adopts the folded plate type, reduces the welds as much as possible, increases the strength, and makes positive and negative pressure tests to ensure the reliability of product sealing. A low magnetic steel plate or magnetic shield shall be used at appropriate parts to reduce the additional loss caused by the magnetic field of bus conductor on the tank wall. This work has achieved very good results in seepage prevention and loss reduction.

5.5 Final assembly: after the body is dry, the winding is loose and compressed by hydraulic equipment, which has achieved good results. Vacuum oil injection is adopted to reduce bubbles in the product winding, reduce partial discharge and increase the service life of the product. The use of anti-aging new sealing material improves the original leakage problem.

5.6 Accessories: the main accessory water cooler shall be tubular or spiral plate oil-water cooler, or installed separately or directly fixed on the transformer host.

The on-load tap changer shall be imported from ABB company, MR company, or Changzheng No. 1 plant. In addition to a remote display, it also has a remote control interface.

Transformer oil is made from naphthenic aging transformer oil in Karamay. The protection of oil is fully closed structure (that is, a pressure relief valve with a diaphragm storage tank structure).

6. About transformer maintenance

It is necessary to transport the hanging core after the arrival of the product as long-distance transportation, which mainly involves the loosening of fasteners during transportation and the user’s acceptance of the manufacturer’s products. However, as for the routine overhaul, we think it is necessary to check and replace those mechanical wear parts according to the original overhaul cycle. Such as pumps and other running parts, but for the relatively static transformer, it is not necessary to hang the core for a long time. Only monitoring the quality changes of oil, such as gas chromatography, is enough to grasp the situation of the body, so as to save the maintenance cost and reduce the pollution of the hanging core to the body and oil.

7. Product quality assurance measures

7.1 Ensure long-term overload of 20%. For example, if the transformer for LF furnace has a capacity of 20000kva, the design basis capacity of the winding shall be set to 24000kva, especially the current density and switch selection shall be selected according to 24000kva, and the impedance voltage shall not be greater than 8% at 24000kva. With good external characteristics and economy, the thermal load calculation of the transformer is set at 24000kva, and the lead, secondary outlet, cooler and other load related accessories are selected under the condition that 24000kva has a certain margin.

7.2 Technical measures for impact resistance and short circuit resistance: due to the long production time of electric furnace transformer, especially the impact state of electric arc steelmaking furnace is worse than that of LF furnace. The main technical measures adopted by our company are to improve the axial and radial stability of transformer coil, so as to reduce the accumulation of damage to transformer coil caused by each impact. Specific measures:

a. Select the electromagnetic wire with a higher voltage level and tightly wrapped paper and surface treatment.

b. After the electromagnetic wire is purchased, it shall be dried first and then wound to prevent the damp insulation paper of the coil, which will affect the amplitude winding tightness of the coil.

c. The cushion block is used after densification to reduce the axial pressure margin of the coil.

d. Depilation treatment of the brace to reduce the friction between the brace and the “dovetail” of the cushion block, so that the force transmission resistance of the coil is small when the coil is pressed axially.

e. Coil drying adopts constant pressure drying.

f. The inner coil adopts multiple support bars and the outer coil adopts external support bars to ensure that the displacement of wire cake is small during short-circuit impact.

g. The body adopts vapor phase drying.

h. Hydraulic device is used for pressing the body.

7.3 Technical measures to ensure no overhaul within 20 years of operation. Our company’s main products are mainly the stability and reliability of transformer windings. This has been explained, followed by the aging of transformer oil and the aging of seals. The transformer oil, we choose naphthenic base oil from Karamay, Xinjiang, which has strong anti-aging ability. With a closed structure, diaphragm oil storage tank with pressure relief valve, so that oil does not contact with air, so oil in normal operation can be used in 20 years. Besides anti-aging mats, the main sealing surfaces should be machined and treated, so that the three sides of the pad and metal will be compressed, and the contact with air will be reduced. In addition, the users are required to perform an oil spectrum analysis every 6 months and file in order to distinguish the normal aging of the oil from the failure operation, and ensure that the products used are at ease. The transformer’s load switch suggests that the oil breakdown voltage should be made in the switching switch according to the number of operations. The value should be consistent with the switch, and then in the design, consider that all fasteners of the body adopt butterfly washers to prevent looseness, so as to strengthen the reliability of locking.

7.4 Appearance features: in the design, the product structure is compact. Various transformer control lines are connected to a unified junction box and the purpose is explained to make it beautiful and easy to operate.

 

Customized Transformer of Ladle Refining Furnace

 

We can design and manufacture the transformer of the ladle refining furnace according to the client’s required capacity, working hours, power supply, raw materials, and other related parameters. It can also be matched for users who already have the transformer of the ladle refining furnace.

 

Custom Range

Rated capacity: 2,000-44,000 KVA

Primary Voltage: 10-35 KV

Secondary Voltage: 185-486V

Weight: 8,000-78,000 kg

 

Service

We can provide foundation layout and layout drawings

We will send engineers to your factory to install and debug machines and provide reliable after-sales service.

Competitive price and excellent quality

Our machines are easy to operate and maintain

Less investment

Stable performance

Products can be customized according to different need

Production capacity can be adjusted according to customer requirements

Low energy consumption

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